US5165280A - Device for testing of oblong objects by means of ultrasonic waves - Google Patents

Device for testing of oblong objects by means of ultrasonic waves Download PDF

Info

Publication number
US5165280A
US5165280A US07/605,360 US60536090A US5165280A US 5165280 A US5165280 A US 5165280A US 60536090 A US60536090 A US 60536090A US 5165280 A US5165280 A US 5165280A
Authority
US
United States
Prior art keywords
ultrasonic
transducer
receiving
transducer elements
angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/605,360
Other languages
English (en)
Inventor
Walter Sternberg
Michael Schmeisser
Michael Strauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nukem GmbH
Original Assignee
Nukem GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nukem GmbH filed Critical Nukem GmbH
Assigned to NUKEM GMBH, A CORP. OF THE FED. REP. OF GERMANY reassignment NUKEM GMBH, A CORP. OF THE FED. REP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STRAUSS, MICHAEL, SCHMEISSER, MICHAEL, STERNBERG, WALTER
Application granted granted Critical
Publication of US5165280A publication Critical patent/US5165280A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • G01N29/2487—Directing probes, e.g. angle probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/11—Analysing solids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects

Definitions

  • the present invention relates to a device for ultrasonic inspection of cylindrical objects provided with at least one ultrasonic transducer constituting a transmitter for ultrasonic waves which are transmitted via a coupling medium into an respectively object, and with receiving means for ultrasonic waves reflected by faults in the object and causing in the receiving means output signals which are evaluated in evaluation means for detecting faults in the object.
  • ultrasonic inspection excitation pulses are generated by inspection circuits and activate ultrasonic oscillators, for example in the form of ultrasonic transducers heads, for emission of ultrasonic waves.
  • the ultrasonic transducers are coupled to the test specimens via a medium, for example water.
  • ultrasonic transducers are provided that convert ultrasonic waves into electrical signals which are selected, amplified and evaluated by inspection circuits with for example time gates and orifices.
  • the evaluation relates to the amplitudes of the signals and to the delays between the signals.
  • the test information e.g. the amplitudes, limit value overshoots, delays etc. can be acquired, evaluated an recorded with a data processing facility and displayed on a monitor.
  • faults can occur in these products that are at an angle of inclination in relation to the longitudinal axis. Faults may also be present in the material prior to skew-rolling. If faults of this type show a slanting angle of approx. 45° to the longitudinal axis of the respective object, only the angular position changes, but not the orientation of the fault during rolling. Faults of this type are usually in the range between 5° and 50° after rolling.
  • a possible device for detection of the faults described above comprises annularly arranged ultrasonic transducers operating as transmitter and/or receivers for ultrasonic waves. As a general principle, only those faults are measured that run below an angle of 45° or 135° respectively to the longitudinal axis of the workpiece.
  • the ultrasonic testing heads must be aligned individually as regards their acoustic irradiation angle so that those faults running at an angle to the longitudinal axis are also detected.
  • a device of this type is expensive. The setting of the ultrasonic testing head is time-consuming and in addition only a relatively low testing speed is feasible.
  • An object of the present invention is to provide a device for detecting faults having slanting angle of substantially less than 90° to the longitudinal axis of the object as simply as possible.
  • At least three ultrasonic transducers arranged in a row are arranged along a line next to one another or in steps with sound-transmitting or sound-receiving surfaces parallel to one another and to the line.
  • the outer ultrasonic transducers of the row constitute receivers for ultrasonic waves only.
  • the transducer or transducers surrounded by the outer transducers constitute either transmitters only or transmitters and receivers for ultrasonic waves.
  • the line is inclined against the longitudinal axis of the object by a slanting angle in the range between 5° and 20°.
  • a relative movement takes place between the object and the row of ultrasonic transducers during the test.
  • the surface sections of the object are moved one after the other past the ultrasonic transducers in a helical manner.
  • the ultrasonic transducers can be stationary while the object is being conveyed in its longitudinal direction and turned at the same time. The reverse arrangement is also possible.
  • the device described in the above allows "inclined faults" too to be found with simple means.
  • three ultrasonic transducers are arranged in a row, which makes for a particularly simple design.
  • the angle between the longitudinal axis of the object in question and the direction of the effect of a tool, such as skewed rollers, is set for treatment of the object and is therefore usually predetermined. Based on this angle, it is possibly to approximately predict the change in the angular position of inclined faults during a rolling operation, for example.
  • the device described above permits particularly good fault when the inclination of the line of ultrasonic transducers is one third of the slanting angle of a fault to the longitudinal axis of the object in test.
  • a angle of the line must be provided of 5° to the longitudinal axis of the respective object.
  • slanting angles of the lines of 10°, 15° or 18° to the longitudinal axis, it is possible in principle to detect faults with up to 30°, 45° or 60° inclination respectively against the longitudinal axis.
  • the centre ultrasonic transducer for transmitting ultrasonic waves can also be constituted as a receiving ultrasonic transducer.
  • amplifiers are connected to the ultrasonic transducers in an evaluation device.
  • the amplification factors of the amplifiers for the receiving ultrasonic transducers arranged on either side of a transmitting ultrasonic transducer are set higher than the amplification factor for the transmitting/receiving ultrasonic transducer.
  • the amplification factor is set up to 10 times higher than the amplification factor of the amplifier connected to the transmitting/receiving ultrasonic transducer.
  • the receiver of the transmitting/receiving ultrasonic transducer in an array as described above generates, in the case of inclined faults with an inclination of the fault against the longitudinal axis of three times the inclination of the line of ultrasonic testing heads, higher amplitudes of the fault signals than the adjacent ultrasonic transducers provided the faults do not diverge by more than 5° from the "ideal inclination". If the actual faults do diverge by more than 5° from the ideal inclination at which the inclination of the line of ultrasonic transducers is 1/3 of the inclination of the assumed faults, the receiving ultrasonic testing heads arranged on either side of the transmitting ultrasonic transducer generate higher amplitudes. Amplitudes of this type are completely sufficient for fault detection, so that the use of the transmitting ultrasonic transducers as a receiver also can be dispensed with in order to reduce the measurement technology expenditure.
  • the transducer line can comprise single testing transducers arranged in a row and in steps to achieve the same distance to the object for each transducer. The result is identical acoustic irradiation characteristics that ensure even pickup of the signals.
  • the normal lines extending from the testing head surfaces sound-reflecting surfaces
  • the stepped arrangement ensures furthermore a shallow construction depth. This is an advantage for the volume of the test basin and the design of the mechanical system.
  • more than three transducers can be arranged along a line to achieve a higher test speed.
  • groups of three subsequent transducers are connected to form a measuring unit comprising a receiving, a transmitting and a further receiving head.
  • the transmitting ultrasonic transducer is also provided to operate as a receiving ultrasonic transducer.
  • a further proposal worthy of note provides for divergence of the acoustic irradiation angles of the individual transducers, i.e. individual settability. As a result, faults can be detected in an even greater angular range.
  • FIG. 1 a principle drawing of a first embodiment of a device in accordance with the invention for ultrasonic inspection of cylindrical objects using a measuring array comprising three transducers,
  • FIG. 2 a principle drawing of a second embodiment of a device in accordance with the invention for ultrasonic inspection of cylindrical objects using a measuring array probe comprising three transducers,
  • FIG. 3 a principle drawing of a measuring array probe comprising more than three transducers and corresponding to the first embodiment of the device in accordance with the invention for ultrasonic inspection of cylindrical objects
  • FIG. 4 a principle drawing of a measuring array probe comprising more than three transducers and corresponding to the second embodiment of the device in accordance with the invention for ultrasonic inspection of cylindrical objects and
  • FIG. 5 details of the devices shown in FIGS. 1-4.
  • a device for ultrasonic inspection of cylindrical objects with regular geometric surface, in particular pipes (1) or bars, contains three ultrasonic transducers (2), (3), (4) arranged in a row next to one another.
  • the ultrasonic transducers (2), (3) and (4) can comprise an oscillator acting as three single oscillators following division of an electrode.
  • the centre ultrasonic transducer (3) operates as a transmitting ultrasonic transducer or as a transmitting/receiving ultrasonic transducer.
  • the two external ultrasonic transducers (2), (4) are receiving ultrasonic transducers.
  • the ultrasonic transducers (2), (3) and (4) practically have a "base oscillator", the distance from the pipe (1) varies from transducer to transducer.
  • the pipes (1) are moved in a water bath (5) in the direction of their longitudinal axis (6) past the ultrasonic transducers (2), (3), (4) and turned simultaneously such that the various surface sections pass the ultrasonic transducers (2), (3), (4) in a helical form one after the other.
  • ultrasonic transducers it is also possible to arrange more than three ultrasonic transducers in a row next to one another (FIG. 3 or FIG. 4). With more than three ultrasonic transducers, three consecutive transducers (E1), (E2) and (E3), or (E2), (E3) and (E4) . . . are connected as one measuring unit in each case, the two outer ultrasonic transducers being receiving ones while the intermediate one is at least a transmitting and if necessary also a receiving ultrasonic transducer.
  • the ultrasonic transducers (2), (3), (4) (FIG. 1) and if necessary more ultrasonic transducers (E1) to (En) (FIG. 3) are arranged in a row along a line (7).
  • the measuring units comprise individual transducers (E1') . . . (En') in a row, the sound-receiving oscillator surfaces running parallel to one another and parallel to the line (7).
  • the construction of line with individual transducers has the advantage that a substantially constant distance between the respective transducer (E1') . . . (En') and the pipe (1) is achieved, and thereby constant acoustic irradiation characteristics.
  • FIG. 4- as in FIG. 3--there are shown three consecutive transducers (E1') to (E3') . . . (En-2') to (En') which are connected to form one measuring unit, with the outer transducers operating as receivers one and the enclosed transducer in each case being at least a transmitting ultrasonic transducer.
  • the ultrasonic transducers can be plane or line-focussed.
  • FIG. 1 shows a fault (8) extending substantially along the line (9) that is inclined below an angle ⁇ F against the longitudinal axis (6), that is greater than 0° and less than 90° (naturally a fault can also be between 90° and 180°, which is not mentioned for simplicity's sake).
  • the pipes (1) are treated in many cases by skew rollers, for example.
  • the skew rolling operation alters the angular positions of the faults, i.e. the angles ⁇ F of the line (9) passing through the fault in its longitude or width against the longitudinal axis (6) are reduced by skew rolling, so that hardly any angles ⁇ F occur in the range between 70° and 90° once skew rolling is completed. If faults are present at the start of the skew rolling operation that are substantially below an angle of 45° to the longitudinal axis (6), then their position changes, with the slanting possibly being in the range between 5° and 40° after rolling. The direction of the faults, i.e. their orientation, is not however changed.
  • the ultrasonic transducers (2), (3), (4) are used, arranged adjacently on a support, for example, and linked to the pipe (1) by the water.
  • the three or more ultrasonic transducers form the transducerline and can be adjusted together.
  • the ultrasonic transducers (2), (3) and (4) are inclined against the longitudinal axis (6) with their line (7) below an angle ⁇ D differing from 0° and 90° (or 90° and 180° respectively). It has become clear that the angle of inclination of the line (7), i.e. the slanting angle ⁇ D of the transducer line against the longitudinal axis (6), should be one third of the inclination angle ⁇ F of a fault against the longitudinal axis (6) in order to detect this fault with a high echo signal.
  • the acoustic irradiation angle is then normal to the line (7) of the testing head line. With inclination angles of 5°, 10°, 15° or 18° of the line (7) or of the transducer line against the longitudinal axis (6), faults with angles of inclination of approx. 15°, 30°, 45° and 60° are adequately covered.
  • the transducer line itself can be offset in relation to the plane passing horizontally through the centre axis (6) of the pipe (1) such that an acoustic irradiation angle of preferably 19° is obtained (acoustic irradiation angle equal to angle between impingeing ultrasound and sounder at impingement point).
  • the receiving ultrasonic transducers (2) and (4) are each provided with amplifiers (10), (11) located in an evaluation array (12).
  • the transmitting/receiving ultrasonic transducer (13) is connected by its receiver part to an amplifier (14).
  • the amplifier (14) is subjected to control signals from a transmitting and receiving cycle control (15).
  • the amplification factors of the three amplifiers (10), (11), (13) are adjustable to various values.
  • the outputs of amplifiers (10), (11), (13) are connected to a unit (16) for echo amplitude testing, this device being a data processing system, for example a computer also having a monitor (17).
  • the transmitting and receiving cycle control, the device (16) and the monitor (17) are integral parts of the evaluation array (2) generating a visual and/or audible signal in the event of a fault and/or recording the fault on a storage medium not shown in detail.
  • the amplifiers (10), (11) of the receiving ultrasonic transducers on either side of the transmitting ultrasonic transducer have an amplification factor up to 10 times that of amplifier (13).
  • the receiving function of the ultrasonic transducer (3) can be dispensed with. This also saves the need for the entire corresponding receiving channel.
  • the receiving part of the ultrasonic transducer (3) provides after receiving ultrasonic signals a higher amplitude than the receibing ultrasonic transducers only for inclined faults with an inclination ⁇ F approximately of 3 ⁇ D .
  • the discrimination of faults within windows of time set inside the evaluation array (12) takes place when the threshold value is exceeded, i.e. normally. Windows of time can also be shut off when no discrimination of the received ultrasonic echo signals is required.
  • the window width is settable. The start of window can be derived from a triggering cycle of the transmitting and receiving cycle control (15).
  • Faults are determined by assessing the ultrasonic echo amplitude received inside the set window of time at every test cycle generated by the transmitting and receiving cycle control (15).
  • a separate threshold value can be preset for every window and also for every receiving channel.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
US07/605,360 1990-08-28 1990-10-30 Device for testing of oblong objects by means of ultrasonic waves Expired - Fee Related US5165280A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4027161 1990-08-28
DE4027161A DE4027161A1 (de) 1990-08-28 1990-08-28 Vorrichtung zur pruefung von laenglichen gegenstaenden mittels ultraschallwellen

Publications (1)

Publication Number Publication Date
US5165280A true US5165280A (en) 1992-11-24

Family

ID=6413068

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/605,360 Expired - Fee Related US5165280A (en) 1990-08-28 1990-10-30 Device for testing of oblong objects by means of ultrasonic waves

Country Status (4)

Country Link
US (1) US5165280A (enrdf_load_stackoverflow)
DE (1) DE4027161A1 (enrdf_load_stackoverflow)
FR (1) FR2667154A1 (enrdf_load_stackoverflow)
IT (1) IT1250000B (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319683A (en) * 1993-08-09 1994-06-07 Westinghouse Electric Corp. Calibration arangement and method of calibrating an inspection instrument
US5431054A (en) * 1994-04-07 1995-07-11 Reeves; R. Dale Ultrasonic flaw detection device
US5471879A (en) * 1992-09-14 1995-12-05 Compagnie Europeene Du Zirconium Cezus Ultrasonic process for testing, by immersion, a metal piece and use thereof
US6115326A (en) * 1998-10-22 2000-09-05 Integrated Medical Systems, Inc. Ultrasonic micro-machined selectable transducer array
US6266983B1 (en) * 1998-12-09 2001-07-31 Kawasaki Steel Corporation Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip
US6651502B1 (en) 2002-04-03 2003-11-25 The United States Of America As Represented By The Secretary Of The Navy Method for acoustic imaging of a tubular shape
US20080289424A1 (en) * 2007-05-25 2008-11-27 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US20120036934A1 (en) * 2004-12-11 2012-02-16 Kroening Michael Method using ultrasound for the non-destructive examination of a test body
US20120055252A1 (en) * 2007-03-15 2012-03-08 Rainer Boehm Method and device for non-destructive material testing of a test object using ultrasonic waves
US9291520B2 (en) 2011-08-12 2016-03-22 Mueller International, Llc Fire hydrant leak detector
US9528903B2 (en) 2014-10-01 2016-12-27 Mueller International, Llc Piezoelectric vibration sensor for fluid leak detection
US9849322B2 (en) 2010-06-16 2017-12-26 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US9939344B2 (en) 2012-10-26 2018-04-10 Mueller International, Llc Detecting leaks in a fluid distribution system
US10283857B2 (en) 2016-02-12 2019-05-07 Mueller International, Llc Nozzle cap multi-band antenna assembly
US10305178B2 (en) 2016-02-12 2019-05-28 Mueller International, Llc Nozzle cap multi-band antenna assembly
US10859462B2 (en) 2018-09-04 2020-12-08 Mueller International, Llc Hydrant cap leak detector with oriented sensor
US11342656B2 (en) 2018-12-28 2022-05-24 Mueller International, Llc Nozzle cap encapsulated antenna system
US11473993B2 (en) 2019-05-31 2022-10-18 Mueller International, Llc Hydrant nozzle cap
US11542690B2 (en) 2020-05-14 2023-01-03 Mueller International, Llc Hydrant nozzle cap adapter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6725721B2 (en) * 2001-10-22 2004-04-27 Magnetic Analysis Corporation Ultrasonic multi-element transducers and methods for testing
DE102006028364A1 (de) * 2006-06-19 2007-12-27 Aluminium Norf Gmbh Verfahren und Vorrichtung zur Zustandsüberwachung von Walzen
DE102008039818B4 (de) 2008-08-22 2015-10-01 Salzgitter Mannesmann Precision Gmbh Verfahren zur zerstörungsfreien Prüfung von metallischen Werkstücken auf Fehler mittels Ultraschall

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228232A (en) * 1962-08-23 1966-01-11 American Mach & Foundry Ultrasonic inspection device
US3683680A (en) * 1970-02-03 1972-08-15 British Railways Board Ultrasonic flaw detection apparatus
US4275598A (en) * 1977-07-15 1981-06-30 Kraftwerk Union Aktiengesellschaft Ultrasonic testing device
JPS5763447A (en) * 1980-10-06 1982-04-16 Toshiba Corp Ultrasonic flaw detector
US4523468A (en) * 1983-10-03 1985-06-18 Trw Inc. Phased array inspection of cylindrical objects
SU1293638A1 (ru) * 1985-11-10 1987-02-28 Научно-производственное объединение по технологии машиностроения Способ ультразвукового контрол изделий
SU1416904A1 (ru) * 1986-05-26 1988-08-15 Институт Прикладной Физики Ан Бсср Ультразвуковой преобразователь

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE929153C (de) * 1953-01-28 1955-06-20 Siemens Reiniger Werke Ag Ultraschall-Schwingeranordnung zur zerstoerungsfreien Werkstoffpruefung mittels Ultraschall-Impulsen
DE1026554B (de) * 1954-09-03 1958-03-20 Siemens Ag Anordnung zur Pruefung von Walzgut mit Ultraschallimpulsen
DE2751810A1 (de) * 1977-11-19 1979-05-23 Ibema Gmbh & Co Kg Ultraschall-pruefvorrichtung zum zerstoerungsfreien pruefen von schweissnaehten
DE2939480A1 (de) * 1979-09-28 1981-04-16 Kubota Ltd. Verfahren zur ermittlung von rissen u.dgl. in einem rohr mit hilfe von ultraschall
DE8403661U1 (de) * 1984-02-08 1984-05-03 Eberlein, Herbert, Dipl.-Ing., 8871 Bubesheim Vorrichtung zum anfertigen von bilderrahmen
DE8529564U1 (de) * 1985-10-17 1987-04-09 Kraftwerk Union AG, 4330 Mülheim Prüfkopf zur Ultraschallprüfung
US4641531A (en) * 1986-03-27 1987-02-10 Reeves Roger D Ultrasonic inspection apparatus and method for locating multiple defects in eccentric wall tubular goods
DE3832223A1 (de) * 1988-09-22 1990-03-29 Krautkraemer Gmbh Vorrichtung zur ultraschallpruefung langgestreckter, rotationssymmetrischer pruefstuecke nach dem einkopf-impuls-reflexionsverfahren

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228232A (en) * 1962-08-23 1966-01-11 American Mach & Foundry Ultrasonic inspection device
US3683680A (en) * 1970-02-03 1972-08-15 British Railways Board Ultrasonic flaw detection apparatus
US4275598A (en) * 1977-07-15 1981-06-30 Kraftwerk Union Aktiengesellschaft Ultrasonic testing device
JPS5763447A (en) * 1980-10-06 1982-04-16 Toshiba Corp Ultrasonic flaw detector
US4523468A (en) * 1983-10-03 1985-06-18 Trw Inc. Phased array inspection of cylindrical objects
SU1293638A1 (ru) * 1985-11-10 1987-02-28 Научно-производственное объединение по технологии машиностроения Способ ультразвукового контрол изделий
SU1416904A1 (ru) * 1986-05-26 1988-08-15 Институт Прикладной Физики Ан Бсср Ультразвуковой преобразователь

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471879A (en) * 1992-09-14 1995-12-05 Compagnie Europeene Du Zirconium Cezus Ultrasonic process for testing, by immersion, a metal piece and use thereof
US5319683A (en) * 1993-08-09 1994-06-07 Westinghouse Electric Corp. Calibration arangement and method of calibrating an inspection instrument
US5431054A (en) * 1994-04-07 1995-07-11 Reeves; R. Dale Ultrasonic flaw detection device
US6115326A (en) * 1998-10-22 2000-09-05 Integrated Medical Systems, Inc. Ultrasonic micro-machined selectable transducer array
US6266983B1 (en) * 1998-12-09 2001-07-31 Kawasaki Steel Corporation Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip
US6651502B1 (en) 2002-04-03 2003-11-25 The United States Of America As Represented By The Secretary Of The Navy Method for acoustic imaging of a tubular shape
US8365600B2 (en) * 2004-12-11 2013-02-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method using ultrasound for the non-destructive examination of a test body
US20120036934A1 (en) * 2004-12-11 2012-02-16 Kroening Michael Method using ultrasound for the non-destructive examination of a test body
US20120055252A1 (en) * 2007-03-15 2012-03-08 Rainer Boehm Method and device for non-destructive material testing of a test object using ultrasonic waves
US8656782B2 (en) * 2007-03-15 2014-02-25 Siemens Aktiengesellschaft Method and device for non-destructive material testing of a test object using ultrasonic waves
US9970904B2 (en) 2007-05-25 2018-05-15 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US20080289424A1 (en) * 2007-05-25 2008-11-27 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US8397575B2 (en) 2007-05-25 2013-03-19 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US7757559B2 (en) 2007-05-25 2010-07-20 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US8997574B2 (en) 2007-05-25 2015-04-07 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US20110067496A1 (en) * 2007-05-25 2011-03-24 Magnetic Analysis Corporation Oblique flaw detection using ultrasonic transducers
US10881888B2 (en) 2010-06-16 2021-01-05 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US10857403B2 (en) 2010-06-16 2020-12-08 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US11590376B2 (en) 2010-06-16 2023-02-28 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US9849322B2 (en) 2010-06-16 2017-12-26 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US9861848B2 (en) 2010-06-16 2018-01-09 Mueller International, Llc Infrastructure monitoring devices, systems, and methods
US9291520B2 (en) 2011-08-12 2016-03-22 Mueller International, Llc Fire hydrant leak detector
US10175135B2 (en) 2011-08-12 2019-01-08 Mueller International, Llc Leak detector
US11630021B2 (en) 2011-08-12 2023-04-18 Mueller International, Llc Enclosure for leak detector
US9772250B2 (en) 2011-08-12 2017-09-26 Mueller International, Llc Leak detector and sensor
US10386257B2 (en) 2011-08-12 2019-08-20 Mueller International, Llc Enclosure for leak detector
US9593999B2 (en) 2011-08-12 2017-03-14 Mueller International, Llc Enclosure for leak detector
US11680865B2 (en) 2011-08-12 2023-06-20 Mueller International, Llc Leak detection in water distribution systems using acoustic signals
US9939344B2 (en) 2012-10-26 2018-04-10 Mueller International, Llc Detecting leaks in a fluid distribution system
US9528903B2 (en) 2014-10-01 2016-12-27 Mueller International, Llc Piezoelectric vibration sensor for fluid leak detection
US11336004B2 (en) 2016-02-12 2022-05-17 Mueller International, Llc Nozzle cap multi-band antenna assembly
US11469494B2 (en) 2016-02-12 2022-10-11 Mueller International, Llc Nozzle cap multi-band antenna assembly
US12212053B2 (en) 2016-02-12 2025-01-28 Mueller International, Llc Nozzle cap multi-band antenna assembly
US11527821B2 (en) 2016-02-12 2022-12-13 Mueller International, Llc Nozzle cap assembly
US11837782B2 (en) 2016-02-12 2023-12-05 Mueller International, Llc Nozzle cap assembly
US10305178B2 (en) 2016-02-12 2019-05-28 Mueller International, Llc Nozzle cap multi-band antenna assembly
US10283857B2 (en) 2016-02-12 2019-05-07 Mueller International, Llc Nozzle cap multi-band antenna assembly
US11652284B2 (en) 2016-02-12 2023-05-16 Mueller International, Llc Nozzle cap assembly
US10859462B2 (en) 2018-09-04 2020-12-08 Mueller International, Llc Hydrant cap leak detector with oriented sensor
US11422054B2 (en) 2018-09-04 2022-08-23 Mueller International, Llc Hydrant cap leak detector with oriented sensor
US11692901B2 (en) 2018-09-04 2023-07-04 Mueller International, Llc Hydrant cap leak detector with oriented sensor
US11342656B2 (en) 2018-12-28 2022-05-24 Mueller International, Llc Nozzle cap encapsulated antenna system
US11624674B2 (en) 2019-05-31 2023-04-11 Mueller International, Llc Hydrant nozzle cap with antenna
US12078572B2 (en) 2019-05-31 2024-09-03 Mueller International, Llc Hydrant nozzle cap
US11473993B2 (en) 2019-05-31 2022-10-18 Mueller International, Llc Hydrant nozzle cap
US11542690B2 (en) 2020-05-14 2023-01-03 Mueller International, Llc Hydrant nozzle cap adapter
US12084844B2 (en) 2020-05-14 2024-09-10 Mueller International, Llc Hydrant nozzle cap adapter

Also Published As

Publication number Publication date
FR2667154A1 (fr) 1992-03-27
DE4027161A1 (de) 1992-03-05
ITTO910662A1 (it) 1993-02-27
ITTO910662A0 (it) 1991-08-27
IT1250000B (it) 1995-03-30
DE4027161C2 (enrdf_load_stackoverflow) 1993-04-29

Similar Documents

Publication Publication Date Title
US5165280A (en) Device for testing of oblong objects by means of ultrasonic waves
US5431054A (en) Ultrasonic flaw detection device
EP0826148B1 (en) Ultrasonic inspection
US7789286B2 (en) Method and apparatus for assessing the quality of spot welds
US4658649A (en) Ultrasonic method and device for detecting and measuring defects in metal media
JP5535044B2 (ja) 被検体の超音波無破壊試験のための回路装置
US8291766B2 (en) Method and device for ultrasound testing
US11408861B2 (en) Transducer and transducer arrangement for ultrasonic probe systems, ultrasonic probe system and inspection method
US10533976B2 (en) Ultrasonic inspection system
JP2000146921A (ja) 超音波探傷方法及び装置
US3942361A (en) Arrangement for testing thick-walled specimens by the ultrasonic pulse-echo method
JP2009058238A (ja) 欠陥検査方法および装置
US4596142A (en) Ultrasonic resonance for detecting changes in elastic properties
RU2227911C1 (ru) Способ многоканального ультразвукового контроля рельсов
Michaels Effectiveness of in situ damage localization methods using sparse ultrasonic sensor arrays
JPH01145565A (ja) 超音波探傷装置
Saglio Better detection of large poorly oriented plane defects by ultrasonics
US7069786B2 (en) Ultrasonic transducer structures
US20250093302A1 (en) Ultrasonic flaw detection system
JP3562159B2 (ja) 金属板の多チャンネル自動超音波探傷方法および装置
Loveday et al. Influence of resonant transducer variations on long range guided wave monitoring of rail track
JP3606146B2 (ja) 超音波探傷方法およびその装置
JPH08261992A (ja) 超音波探傷装置
RU1816966C (ru) Ультразвуковой дефектоскоп-толщиномер
JP2007147423A (ja) 圧延材の内部欠陥検出方法および内部欠陥検出装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: NUKEM GMBH, 8755 ALZENAU, A CORP. OF THE FED. REP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:STERNBERG, WALTER;SCHMEISSER, MICHAEL;STRAUSS, MICHAEL;REEL/FRAME:005493/0888;SIGNING DATES FROM 19900905 TO 19900907

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19961127

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362